JP4049467B2 - How to correct uneven settlement of soil concrete - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a correction method when ground subsidence progresses in a landfill and uneven settlement occurs in a soil concrete floor.
[0002]
[Prior art]
Conventionally, in a building constructed on soft ground such as landfill, for example, soil concrete in a factory, when the ground is consolidated due to the passage of time and the soil concrete floor sinks unevenly, for example, as conventional example 1, An overlay method has been implemented in which ultra-high-strength concrete is cast on the sinking surface to restore the flatness of the floor.
[0003]
Further, as conventional example 2, as shown in FIG. 11, a pillow 26 is laid on the underground beam 25, and a required number of reaction force girders 27 are horizontally mounted in the orthogonal direction, and a plurality of reaction force girders 27 are placed on the reaction force girder 27. There is known a construction method in which a jack 28 is installed and the floor 30 is pulled up by a wire 29 so as to ensure flatness.
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned conventional example 1, the construction cost is low, but dust is generated due to the chiseling work, and if the floor is thickened and corrected, it is necessary to reconstruct the floor line, etc. There are problems such as being likely to occur.
[0005]
Moreover, in the prior art 2, the whole apparatus including the reaction force girder becomes large-scale, and it is difficult to perform the construction inside the existing building. It is necessary that there are almost no obstacles on the floor, and it cannot be constructed in a building in use. In addition, the structural strength of the underground beam is often insufficient, and there is a problem that the construction cost is increased because the cost is equal to or higher than that when the floor concrete is removed and newly installed. The method for correcting uneven settlement of soil concrete according to the present invention is proposed to solve such a problem.
[0006]
[Means for Solving the Problems]
The gist for solving the above-mentioned problem of the method for correcting uneven settlement of interstitial concrete according to the present invention is to cut off a part of the interstitial concrete to form a reaction force plate in the interstitial concrete that has been subsidously dissected. A jack is provided on the force plate, and a pedestal is fixed to the concrete around the reaction force plate with the pedestal of the jack cut off on the jack, and is placed around the reaction force plate. A plurality of holes for injecting mortar are drilled, and then the cut reaction force plate is obtained by taking a reaction force on the cut reaction force plate and lifting a necessary amount of the surrounding soil concrete by a jack through the mount. Forming a gap between the soil concrete around the ground and the ground, filling the gap with the mortar from the hole, and after the mortar filled in the gap is cured, the space above the cut reaction force plate In mortar Filling and cured, is to modify the floor level horizontally.
[0007]
Further, the gist of the method for correcting the uneven settlement of the interstitial concrete according to the present invention is to cut off a part of the interstitial concrete to form a reaction force plate in the uneven subsidence concrete, and to surround the entire surface of the cut reaction force plate. A partition plate extending to the ground is provided, a jack is provided on the cut-off reaction plate, and a gantry is formed on the jack, and a pedestal is fixed to the soil concrete around the cut-off reaction plate. Place a plurality of holes for mortar injection around the cut reaction force plate, and then take a reaction force on the cut reaction force plate and use a jack to surround the surrounding soil. By lifting the required amount of concrete, a gap is formed between the soil concrete around the cut reaction plate and the ground, the mortar is filled from the hole into the gap, and the mortar filled in the gap is cured. Later, the cut off Reaction force plate lifting so that the dirt floor concrete flush after the correction, is filled and hardened mortar in the gap below the 該切 dropped reaction force plate is to modify the floor level horizontally.
[0008]
Moreover, the soil concrete is divided into a plurality of correction ranges, and by performing construction from one side of the correction range to the other side in order, the uneven settlement is corrected using the existing equipment in the soil concrete; And monitoring the filling condition of the mortar from holes other than the holes for injecting the mortar.
[0009]
According to the uneven settlement method of soil concrete according to the present invention, the cut reaction force plate obtained by cutting a part of the soil concrete is used as a reaction force plate for jack-up, so that construction can be performed without applying a load to the underground beam. I can do it. For large-area soil-concrete, it is possible to carry out non-uniform settlement correction at any location with minimum equipment. Even when using existing facilities and equipment in warehouses and factories, it is possible to correct uneven settlement. Construction can be performed while checking the filling condition of the mortar.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the method for correcting uneven settlement of soil concrete according to the present invention will be described with reference to the drawings.
[0011]
As shown in FIG. 1, for example, a rectangular cut reaction force plate 1 (800 × 800 mm) and a round hole 2 (about 70 mm in diameter) in a cored portion for mortar injection with respect to an unevenly subsidenced concrete floor ) Ink out.
[0012]
The cut reaction force plate 1 is cut by a cutter. In addition, when the cut reaction force plate 1 is cut off, it may drop suddenly downward. Therefore, as shown in FIG. 2, after cutting in the vertical direction and entering the cutting line a, the anchor is erected. To do. Temporary receiving angles (length is about 1200 mm) 3 are installed between the soil concrete 1a and 1a, for example, at two locations in the transverse direction perpendicular to the cutting line a. This angle 3 has an anchor hole 3a.
[0013]
Then, the anchor protrudes from the hole 3a of the temporary receiving angle 3, and is temporarily fixed with a nut or the like. Then, the cutting line b is made with a cutter in the horizontal direction. The cut reaction force plate 1 whose entire circumference has been cut in this way is slowly lowered while being temporarily received by the temporary receiving angle 3. The pitch of the cut reaction force plate 1 is, for example, 4000 mm in the horizontal direction and 4500 mm in the vertical direction. This cut-off reaction force plate 1 is used as a reaction force table for jacking up, and it is an essential part of the present invention to cut off a certain area of soil concrete into a reaction force table for jack. .
[0014]
Thereafter, the anchor and provisional receiving angle 3 are removed. Next, the core is removed. This operation is performed by core boring with a diameter of 70 mm. Raise the cored concrete up. The arrangement of the round holes 2 formed in this way is set to an intermediate position between the cut-off reaction force plates 1 and 1 in a vertical and horizontal lattice shape as shown in FIG. In short, it is provided in order to be able to inject the mortar to be filled between the lower surface of the soil concrete 1a and the ground surface and to check the amount of the injection.
[0015]
Next, as shown in FIG. 2, holes 4 for chemical anchor (registered trademark) are drilled at eight locations around each cut-off reaction force plate 1 with a drill. As shown in FIG. 3, for example, the hole 4 has a diameter of 20 mm and a depth of 140 mm. A hole 4a having a diameter of 40 mm and a depth of 10 mm is provided in the opening of the hole 4.
[0016]
The holes 4 are cleaned by suction or blower after drilling and with a dedicated brush. A chemical anchor (for example, R16: trade name) which is a resin capsule is inserted into the hole 4. Then, the anchors 5 of all screw bolts are inserted into the holes 4 and are fixed by stirring while applying rotation and impact to the chemical anchors.
[0017]
From the concrete surface, the head of the anchor 5 protrudes about 60 mm. The anchors 5 are cut off and installed in a total of eight locations around the reaction force plate 1 in an orthogonal arrangement.
[0018]
Next, as shown in FIG. 4, a floor raising base 6 formed in advance is placed on the surrounding soil concrete 1 a across each of the cut-off reaction force plates 1 over the floor. The gantry 6 is an H-shaped steel, for example, a gate-shaped one having a length of 1500 mm and a height of 150 mm, which are crossed by crossing each other.
[0019]
Needless to say, this gantry 6 can be appropriately arranged in order to improve accuracy, safety, and workability by making it a cross-girder shape instead of a cross shape depending on the concrete thickness and pulling range.
[0020]
A fixing base plate 6 b is provided at the lower part of the column base 6 a of the gantry 6. As shown in FIG. 5, the base plate 6b is a rectangular steel plate having a thickness of 25 mm and a size of 250 × 250 mm, as shown in FIG. And the attachment hole 6c (diameter 30mm) for anchor 5 insertion is provided in two places.
[0021]
As shown in FIG. 5 (b), the anchor 5 is inserted through the mounting holes 6c of the base plate 6b at eight locations, fixed with square washers and nuts 7, and the rack 6 is fixed to the soil concrete 1a. Fix it. In FIG. 4, reference numeral 6 d indicates a fulcrum stiffener for reinforcing the strength.
[0022]
Next, as shown in FIG. 6, a hydraulic jack 8 is set under the center of the gantry 6. In order to jack up a certain area of the soil concrete 1a at the same time, the hydraulic jack 8 is connected to a stop valve 10 by a pressure hose 9 as shown in FIG. One end of the valve 10 is connected to a manual pump 11 by a pressure hose 9.
[0023]
On the other hand, the round hole 2 shown in FIG. 1 is prepared for mortar injection. For this purpose, as shown in FIG. 8, an injection pipe 12 is inserted into the round hole 2 and sandwiched from both sides by L-shaped angles 13 on the upper part of the pipe protruding from the round hole 2. The mold angle 13 is fixed to the soil concrete 1a with a hole-in anchor 13a.
[0024]
One end of a mortar supply pipe 14 is connected to the upper end of the injection pipe 12, and the other end of the supply pipe 14 is connected to a discharge port (not shown) of the mortar supply apparatus.
[0025]
As described above, after the preparation of jack-up is completed within a certain range of the soil concrete 1a to be subjected to the uneven settlement correction, the plurality of hydraulic jacks 8 are operated by the manual pump 11, and each of the plurality of mounts 6 is moved to the respective sections. Cut and lift the reaction force plate 1a.
[0026]
Since the mount 6 has a different jack-up amount at each position, the floor 6 is measured at the star level measurement point 15 shown in FIG. Moreover, it is preferable to perform jack-up in a plurality of times so as not to apply excessive stress to the soil concrete 1a.
[0027]
In this embodiment, for example, due to the thickness of the soil concrete 1a, the reaction force required for each hydraulic jack 8 is about 8.6 tons, and the stress applied to the ground under the concrete is 13.5 t. / M ² or so. Therefore, the first jack-up is performed at about 5t, the second is performed at about 8t, and the third is performed at about 10t. When performing a certain wide range at a time, as shown in FIG. 7B, automatic control may be performed based on the jack valve and floor level measurement results. In addition, when performing minute control, it is performed by controlling the amount of hydraulic pressure using inverter control.
[0028]
When a predetermined level is reached by measuring the floor level, the stop valve 10 is closed. When the jack-up in a certain range of the soil concrete 1a is completed, the mortar 1b having extremely high fluidity (slump value is about 28 cm) is pressed from the round hole 2 as the mortar injection hole under the soil concrete 1a. inject.
[0029]
This mortar pressure injection operation is not performed simultaneously from all the locations of the round holes 2 in the certain range, but is injected from one or two locations, and the rise of the mortar is confirmed in the other round holes 2. It is.
[0030]
The mortar is cured until it hardens under the soil concrete 1a, and during that time, as shown in FIG. 6 (a), the hydraulic jack 8 is replaced with a replacement support 8a, and the removed hydraulic jack 8 is It is diverted for jacking up the gantry 6 set in the range.
[0031]
After the mortar under the soil concrete 1a is hardened, in the space above the cut reaction force plate 1, reinforcing bars 16 are arranged as shown in FIG. 9, and the upper space of this cut reaction force plate 1 Place mortar on the surface and cure and harden to make the floor surface flush.
[0032]
Such work is repeated in the other range of the soil concrete 1a to correct the uneven settlement of the soil concrete 1a as a whole. Therefore, for the large-area soil concrete 1a, the correction range is divided into a plurality of areas, for example, by constructing in order from the end, it is possible to correct the uneven settlement with the minimum equipment, and in the warehouse and factory It is convenient that the correction method of the present invention can be applied while using the existing equipment / devices.
[0033]
As another embodiment of the present invention, as shown in FIG. 10 (a), when the ground 17 under the soil concrete 1a is quite soft, ground improvement is performed in advance. For this purpose, a grouting hole 18 is formed in the cut-off reaction force plate 1, and a grouting material is press-fitted and stirred into the ground 17 using this hole 18 to form a solid supporting ground column 19 within a certain range. To do. After securing the supporting force of the reaction force plate 1 by cutting off, the uneven settlement correction work for the soil concrete 1a is performed in the same manner as described above.
[0034]
Further, as shown in FIGS. 10 (b) and 10 (c), the cut-off reaction force plate 1 is pulled up and corrected so as to be flush with the upper surface of the soil concrete after correction. The outline of this correction procedure is that after cutting off the reaction force plate 1 with a cutter, the partition plate 20 is inserted around the entire periphery of the cut reaction force plate 1 into the gap created by the cutter to reach the ground 17.
[0035]
Then, the surrounding soil concrete 1 a is lifted by the gantry 6 and the hydraulic jack 8, and mortar is pressurized and injected from the round hole 2. Due to the presence of the partition plate 20, the injected mortar is cut off and does not come into contact with the peripheral wall surface of the reaction force plate 1 and is not integrated.
[0036]
After the mortar has hardened, this time, conversely, a reaction force is applied to the surrounding soil concrete 1a and the cut reaction force plate 1 is pulled up with a jack or the like to be flush with the upper surface (floor surface) of the soil concrete 1a. To do. Then, it is cut off from the injection hole 21 of the cut reaction force plate 1 and mortar is pressurized and injected into the gap under the reaction force plate 1 to be cured.
[0037]
By doing so, for example, when the soil concrete 1a is unreinforced concrete, the floor surface after the non-uniform settlement correction is restored to the original state by pulling up the cut reaction force plate 1 and making it flush with the floor surface. It looks unchanged, and it becomes difficult to understand that it has been corrected without any sense of incongruity.
[0038]
As another embodiment, in the above embodiment, the cut reaction force plate 1 is cut into a rectangular shape, but if this is cut into a circular shape, for example, by core boring with a diameter of about 700 mm, It can be done with a single cutting operation, which shortens the construction period.
[0039]
【The invention's effect】
As described above, the method for correcting uneven settlement of interstitial concrete according to the present invention is a method of cutting a part of the interstitial concrete into a reaction force plate by cutting a part of the interstitial concrete in the uneven subsidence concrete. A jack is provided on the top, and a gantry is placed on the jack, and a pedestal is cut off and the frame fixed on the soil concrete around the reaction force plate is placed, and mortar is injected around the cut reaction force plate A plurality of holes are drilled, and then a reaction force is applied to the cut reaction force plate, and a surrounding soil concrete is lifted by a jack through the mount by a jack, and the periphery of the cut reaction force plate is A gap is formed between the soil concrete and the ground, and the gap is filled with mortar from the hole. After the mortar filled in the gap is hardened, the mortar is placed in the space above the cut reaction force plate. Filling / hardness Since the floor level is corrected horizontally, it becomes possible to jack up the soil concrete without applying a load to the underground beam by taking out the reaction force of the jack with the cut-off reaction force version, and low cost It has an excellent effect that it can be constructed at a small area and can be corrected for uneven settlement at any point within a small range.
[0040]
Further, according to the present invention, in the concrete that has been subsidously settled, a part of the concrete is cut and cut into a reaction force plate, and a partition plate reaching the ground is provided around the entire cut reaction force plate. A jack is provided on the dropping reaction force plate, and a base is formed on the jack, and a pedestal thereof is fixed to soil concrete around the cutting reaction force plate. A plurality of holes for injecting mortar are drilled in the periphery, and then, the reaction force is applied to the cutting reaction force plate, and the surrounding soil concrete is lifted by a jack through the mount and the cutting reaction is performed. A gap is formed between the soil concrete around the force plate and the ground, and the gap is filled with mortar from the hole, and after the mortar filled in the gap is hardened, the cutting reaction force plate is corrected. Flush with the concrete The mortar is filled and hardened in the gap under the cut reaction force plate, and the floor level is corrected horizontally. By being flush, the floor surface can be made in a state that is not different from the original appearance, and an excellent effect is obtained that the floor surface is prevented from becoming a fluttering pattern.
[0041]
In addition, the soil concrete is divided into a plurality of correction ranges, and by constructing from the one side of the correction range to the other side in order, the existing subsidence is corrected while using the existing facilities in the soil concrete, thereby existing It is convenient because it is possible to correct the uneven settlement while using the equipment, and it is possible to correct the uneven settlement of large-area soil concrete with the minimum equipment. Furthermore, by monitoring the mortar filling condition from holes other than the mortar injection hole, an excellent effect is achieved in that the mortar filling accuracy can be maintained at a high level.
[Brief description of the drawings]
FIG. 1 is an explanatory plan view showing a method for correcting uneven settlement of soil concrete according to the present invention.
FIG. 2 is a plan view for explaining the case where the same reaction force plate is cut off.
FIG. 3 is an explanatory diagram in which chemical anchors are provided on the intersoil concrete 1a.
FIG. 4 is a perspective view of a gantry 6 installed across the cut-down reaction force plate 1;
FIG. 5 is a partially enlarged plan view (A) and a front view (B) of a footnote on the gantry 6;
FIGS. 6A and 6B are explanatory views (A) and (B) in a state where a reaction force is applied to the cut-off reaction force plate 1 and a surrounding soil concrete 1a is jacked up.
FIG. 7 is an explanatory diagram (A) of the jackup device and a flowchart (B) of automatic control of jackup.
FIGS. 8A and 8B are explanatory views (a) and (b) of an injection facility for the mortar injection hole.
9 is a perspective view showing a state in which reinforcing bars 16 are arranged in the upper space of the cut reaction force plate 1. FIG.
FIGS. 10A to 10C are explanatory views (a), (b), and (c) showing a correction method according to another embodiment of the present invention.
FIG. 11 is an explanatory view showing a conventional jackup system.
[Explanation of symbols]
1 Cutting reaction force plate, 1a Dirt concrete, 2 round hole for mortar injection,
3 Temporary receiving angle, 3a hole, 4 hole, 5 anchor, 6 frame,
6a column base, 6b base plate, 6c mounting hole, 6d fulcrum stiffener,
7 Square washer and nut, 8 Hydraulic jack, 8a Support for replacement
9 pressure hose, 10 stop valve, 11 manual pump,
12 injection pipe, 13 L angle, 14 mortar supply pipe,
15 level measurement points, 16 reinforcing bars, 17 ground,
18 holes for grout, 19 supporting ground pillars, 20 partition plates, 21 injection holes.

Claims (4)

In the soil concrete that has settled indefinitely, a part of the soil concrete is cut off and cut into a reaction force plate, and a jack is provided on the reaction force plate. Place a stand fixed to the soil concrete around the falling reaction force plate, drill a plurality of holes for mortar injection around the cutting reaction force plate, and then into the cutting reaction force plate A gap is formed between the soil concrete around the cut reaction force plate and the ground by lifting a necessary amount of the surrounding soil concrete through a mount by a jack with a jack, and the gap is formed from the hole. Filling the mortar and curing the mortar filled in the gap, filling and curing the mortar in the space above the cut reaction force plate, and correcting the floor level horizontally;
A method for correcting uneven settlement of soil concrete characterized by In soil concrete that has settled indefinitely, a portion of the soil concrete is cut and cut into a reaction force plate, and a partition plate reaching the ground is provided around the entire surface of the cut reaction force plate. A jack is provided on the jack, and a pedestal is fixed to the concrete around the reaction force plate with the pedestal being cut off, and a mortar for injecting mortar around the cut reaction force plate. A plurality of holes are drilled, and then a reaction force is applied to the cut-off reaction plate, and the surrounding soil concrete is lifted by a jack through the mount and the surrounding soil around the cut-off plate is removed. A gap is formed between the concrete and the ground, and the gap is filled with mortar from the hole, and after the mortar filled in the gap is hardened, the cut-off reaction force plate is placed on the surface of the modified soil concrete and the surface. Lift to be one , Mortar is filled and cured with a gap under the 該切 dropped reactive force plate, modifying the floor level horizontally,
A method for correcting uneven settlement of soil concrete characterized by The soil concrete is divided into a plurality of correction ranges, and by applying to the other side in order from one side of the correction range, correcting the uneven settlement while using the existing equipment in the soil concrete,
The method for correcting uneven settlement of soil concrete according to claim 1 or 2. Monitoring mortar filling from holes other than mortar injection holes;
The method for correcting uneven settlement of soil concrete according to claim 1, 2, or 3.

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